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<?php /** * Registry object that contains information about the current context. * @warning Is a bit buggy when variables are set to null: it thinks * they don't exist! So use false instead, please. * @note Since the variables Context deals with may not be objects, * references are very important here! Do not remove! */ class HTMLPurifier_Context { /** * Private array that stores the references. * @type array */ private $_storage = array(); /** * Registers a variable into the context. * @param string $name String name * @param mixed $ref Reference to variable to be registered */ public function register($name, &$ref) { if (array_key_exists($name, $this->_storage)) { trigger_error( "Name $name produces collision, cannot re-register", E_USER_ERROR ); return; } $this->_storage[$name] =& $ref; } /** * Retrieves a variable reference from the context. * @param string $name String name * @param bool $ignore_error Boolean whether or not to ignore error * @return mixed */ public function &get($name, $ignore_error = false) { if (!array_key_exists($name, $this->_storage)) { if (!$ignore_error) { trigger_error( "Attempted to retrieve non-existent variable $name", E_USER_ERROR ); } $var = null; // so we can return by reference return $var; } return $this->_storage[$name]; } /** * Destroys a variable in the context. * @param string $name String name */ public function destroy($name) { if (!array_key_exists($name, $this->_storage)) { trigger_error( "Attempted to destroy non-existent variable $name", E_USER_ERROR ); return; } unset($this->_storage[$name]); } /** * Checks whether or not the variable exists. * @param string $name String name * @return bool */ public function exists($name) { return array_key_exists($name, $this->_storage); } /** * Loads a series of variables from an associative array * @param array $context_array Assoc array of variables to load */ public function loadArray($context_array) { foreach ($context_array as $key => $discard) { $this->register($key, $context_array[$key]); } } } // vim: et sw=4 sts=4